TITLE:
Is Robotic Arm Assisted Total Hip Arthroplasty More Bone Preserving than Conventional Hip Replacements and Hip Resurfacing?
AUTHORS:
Rajitha Gunaratne, Ben Levy, Harry D’Souza, Arash Taheri
KEYWORDS:
Arthroplasty, Replacement, Hip
JOURNAL NAME:
Open Journal of Orthopedics,
Vol.12 No.6,
June
10,
2022
ABSTRACT: Background: Total hip arthroplasty (THA) is a common procedure that is increasingly
being performed in younger patients. Deep acetabular reaming will result in
more bone loss and the need for large acetabular components to be implanted. It
can also lead to impingement, loosening, an altered center of rotation, and intraoperative periprosthetic fracture.
The purpose of this study is to determine whether the single ream, robotic
arm-assisted (RAA) THA can preserve a greater volume of bone stock compared to
conventional hip replacement and resurfacing. Methods: We prospectively
recruited 69 patients who had undergone primary THA using the Stryker Trident
Acetabular System® in combination with the Stryker RAA System (MAKO)® and compared their mean reaming weight (g) with that of conventional hip
replacement and resurfacing, as measured by Brennan et al. Comparison of acetabular reaming during hip resurfacing
versus uncemented THA (J Orthop Surg. 2009; 17(1): 42-46). Results: The mean reaming weight using the MAKO system was 9.08 g, which was 29% less
than the reaming weight using uncemented THA and hip resurfacing of 12.75 g.
None of the acetabular cups required screw fixation. During the 35-month
follow-up period, there were no complications related to cup placement or positioning. Conclusions: The use of RAA THA results in statistically significant
preservation of acetabular bone compared to conventional hip replacement and resurfacing.
This approach reflects the increased precision offered by RAA single reaming.
Surgeons may consider utilizing RAA THA, particularly in younger patients, to
better preserve bone stock as this could potentially impact future revision
procedures.